Amentum Holdings, Inc. SEC filings AMTM
Amentum Holdings, Inc. has 194 filings in SEC EDGAR's recent list, going back to Mar 7, 2024. Its latest annual report, Form ARS, was filed on Dec 19, 2025 for the period ended Oct 3, 2025. The latest quarterly report (Form 10-Q) was filed on Aug 11, 2026, covering the quarter ended Jul 3, 2026. The most recent current report (Form 8-K) was filed on Oct 2, 2026 (officer or director change). The company's fiscal year ends on October 2.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Sep 17, 2026 | Aug 14, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Aug 6, 2026 | — |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 7, 2026 | May 6, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 7, 2026 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 26, 2026 | — |
| 4 | Insider transaction | Mar 5, 2026 | Mar 4, 2026 |
| 4 | Insider transaction | Mar 4, 2026 | Mar 2, 2026 |
| 4 | Insider transaction | Feb 18, 2026 | Feb 17, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4/A | Form 4/a | Feb 10, 2026 | Nov 6, 2025 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Feb 10, 2026 | Feb 6, 2026 |
| 4 | Insider transaction | Jan 29, 2026 | Jan 28, 2026 |
| 4/A | Form 4/a | Dec 19, 2025 | Nov 17, 2025 |
| 4/A | Form 4/a | Dec 19, 2025 | Nov 17, 2025 |
| 4/A | Form 4/a | Dec 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Dec 19, 2025 | Dec 17, 2025 |
| 4 | Insider transaction | Dec 9, 2025 | Dec 5, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 19, 2025 | Nov 17, 2025 |
| 4 | Insider transaction | Nov 18, 2025 | Nov 15, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| 4 | Insider transaction | Nov 10, 2025 | Nov 6, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Nov 6, 2025 | — |
| 4 | Insider transaction | May 12, 2025 | May 8, 2025 |
| 4 | Insider transaction | May 12, 2025 | May 8, 2025 |
| 4 | Insider transaction | May 12, 2025 | May 8, 2025 |
| 4 | Insider transaction | May 12, 2025 | May 8, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | May 9, 2025 | — |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 10, 2025 | Apr 8, 2025 |
| 4 | Insider transaction | Apr 8, 2025 | Apr 7, 2025 |
| 4 | Insider transaction | Mar 19, 2025 | Mar 17, 2025 |
| 4 | Insider transaction | Mar 17, 2025 | Mar 13, 2025 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Mar 13, 2025 | — |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 7, 2025 | Mar 5, 2025 |
| 4 | Insider transaction | Mar 5, 2025 | Mar 3, 2025 |
| 3 | Initial insider ownership | Feb 24, 2025 | Feb 17, 2025 |
| 4 | Insider transaction | Feb 20, 2025 | Feb 18, 2025 |
| 4 | Insider transaction | Feb 14, 2025 | Feb 12, 2025 |
| SCHEDULE 13G | Ownership over 5% (passive) | Feb 7, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Feb 5, 2025 | — |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Jan 30, 2025 | — |
| 4 | Insider transaction | Jan 30, 2025 | Jan 28, 2025 |
| 3/A | Filing | Dec 30, 2024 | Dec 17, 2024 |
| 3 | Initial insider ownership | Dec 27, 2024 | Dec 17, 2024 |
| 4 | Insider transaction | Dec 27, 2024 | Dec 17, 2024 |
| 3 | Initial insider ownership | Dec 27, 2024 | Dec 17, 2024 |
| 3 | Initial insider ownership | Dec 27, 2024 | Dec 17, 2024 |
| SCHEDULE 13D | Ownership over 5% (active) | Dec 23, 2024 | — |
| SCHEDULE 13D | Ownership over 5% (active) | Dec 23, 2024 | — |
| 4 | Insider transaction | Dec 23, 2024 | Dec 20, 2024 |
| 4 | Insider transaction | Dec 19, 2024 | Dec 17, 2024 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Dec 19, 2024 | — |
| 4 | Insider transaction | Dec 9, 2024 | Dec 5, 2024 |
| 3 | Initial insider ownership | Dec 9, 2024 | Dec 2, 2024 |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 12, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Nov 12, 2024 | — |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| 4 | Insider transaction | Nov 8, 2024 | Nov 6, 2024 |
| SC 13G/A | Amended ownership over 5% (passive) | Nov 4, 2024 | — |
| SC 13G | Ownership over 5% (passive) | Oct 24, 2024 | — |
| SC 13D | Ownership over 5% (active) | Oct 4, 2024 | — |
| 4 | Insider transaction | Oct 4, 2024 | Oct 2, 2024 |
| 4 | Insider transaction | Oct 4, 2024 | Oct 2, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 23, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 3 | Initial insider ownership | Sep 27, 2024 | Sep 27, 2024 |
| 4 | Insider transaction | Sep 25, 2024 | Sep 23, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
| 3 | Initial insider ownership | Sep 18, 2024 | Sep 18, 2024 |
Showing 130 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Services-Business Services, NEC (SIC 7389)
- Listed as
- AMTM (NYSE)
- Fiscal year ends
- October 2
- Incorporated in
- DE
- Headquarters
- Chantilly, VA
- SEC filer status
- Large accelerated filer
- SEC CIK
- 2011286
- Former names
- Amazon Holdco Inc. (until Sep 18, 2024)
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.